He was sleeping in the living room of the flat when a hand grenade was thrown inside, detonating at about 3am.

Yuusuf Warsame

His heartbroken father Abdiwahid Warsame said Yuusuf’s mother cradled the boy in her arms as he died.

His nine-year-old sister Aisha and little brother Ahmed, five, were asleep in the same room but escaped with just “a few little scratches”.

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Father-of-seven Mr Warsame said it was a “miracle” they had not all been killed.

Yuusuf Warsame

He said: “When I heard the news I had to sit, I could no longer stand up. My wife’s heart is broken.

“She told me he died in front of her.

“She was covered in his blood.

Yuusuf Warsame

“She tried to help, she took him by his chest and held him, but he was dead.

“She cannot do anything at the moment.”

He added that Yuusuf’s bereaved sister Aisha was also asking for her little brother.

The Sparkhill shop run by Yuusuf Warsame's family.

Mr Warsame, who spoke to his family on the phone on Monday afternoon, said: “Both of the younger children are struggling, especially Aisha.

“She knows he’s dead.

“She said to me: ‘When are you coming, because I need Yuusuf’.”

Mr Warsame’s other two young sons, Ibrahim, 14, and Abdiraham, 16, were sleeping in another room at the time of the explosion.

The violence was linked by Swedish media to a gangland feud, with police quoted as saying a man convicted of a fatal shooting last year was registered at the address.

Mr Warsame, who is a Dutch national, said he was desperate to join his family in Sweden.

But he said he had been the authorities in the Netherlands needed a copy of the boy’s death certificate before they could issue him with travel documents.

Mr Warsame has been in the UK since 2001 and owns a shop in Small Heath.

He said: “I don’t have the death certificate because the hospital in Sweden said it was too early for them to issue it.

“I need an ID card but the Dutch embassy here are saying they need the death certificate.

“The only thing I want at the moment is to go to my family.”

He said he had spoken to the Swedish police about the blast but they could only tell him their investigation was continuing.

Mr Warsame also revealed his son had celebrated a birthday on August 15.

The trip to Sweden had been one of the things that all the family’s children had asked to do.

He said: “In our culture we don’t do anything specifically for the birthday, but when our children want something I try to get it for them.

“Instead, he would take chocolates and gifts to his classmates – it is about giving to others. So, on the first day back at school he would do that.”

Mr Warsame said his son loved football and swimming.

He added: “He was a strong swimmer.

“Last week, before they left on August 13, they went to (water park) Water World in Stoke-on-Trent. He was showing me his swimming.”

News of the boy's death has shaken the Midlands' 30,000 Somalis according to community leaders and there has been a constant stream of mourners to the family's grocery store, wanting to pay their respects.

Abdi Hussain, chairman of the Somali Community Organisation, said they were waiting for answers from the Swedish police as to how an innocent boy had come to be caught up in such a violent attack.

He said: "There's a feeling of immense sadness for what has happened.

"We're waiting for the result of the police investigation, and we will have to see."

He said the community in the Sparkhill area was tight-knit with many Somalis from Sweden, Denmark, Norway, the Netherlands and Belgium making their home and livelihoods there.

Mr Hussain added: "When the time for the funeral comes we will ask what the family need of us, and what we can do to help.

"Because the community here - there are lots of connections, and we are close.

"He was an innocent boy just eight years old and we want to know what happened."

Meanwhile, a spokesman for the Dutch embassy in London said: "Our consular department has been in regular contact with Mr Warsame's representatives to discuss his case."He has been invited for a fast-track appointment at the embassy for an emergency travel document."

Mr Warsame said he would be travelling to London to pick up his travel papers on Wednesday morning and hoped to catch a flight to join the rest of the family in Sweden on Wednesday night.